@Article{ 
  fer06,
  author = { Ferriero, Alessandro },
  title = { Action functionals that attain regular minima in presence of energy gaps },
  journal = { Discrete Contin. Dyn. Syst. },
  year = { 2007 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/10/ },
  note = { cvgmt preprint}
}